Cleaning and Stain Removal - stains in my bathroom

even how hard i try to beautify my bathroom with new rugs, curtains and towels, i cannot bear seeing and leaving the dark brownish stains on my tiles. i already used a strong stain remover but the stains remain there. what product could i use then? thanks!

what type of tile? color of stains? what was used? and were are they located at..

first few guesses stains from bath mats, rust stains

Giving cleaning products time to do their job of dissolving scum on showers is a labor saving device. Nonabrasive scrubbies or brushes can be used. Stains from scum and mineral deposits can be removed with a paste of BarKeeper's Friend or Zud (contain rust remover) and water. Apply let set and rub vigorously with damp cleaning rag or white Scotch Brite scrubbie. Depending on severity, repeat applications may be necessary. There are also commercial tile and grout cleaners available. Once cleaning is achieved, keep grout sealed. To maintain, wipe shower after each use with squeegie or chamois to prevent scum and mineral deposits and clean weekly with a tub and tile cleaner.